Which organisms are considered most primitive based upon the structure of their limbs?
A) bats
B) reptiles
C) porpoises
D) penguins
E) birds

Question

Which organisms are considered most primitive based upon the structure of their limbs?​
A) ​bats
B) ​reptiles
C) ​porpoises
D) ​penguins
E) ​birds

Quizplus · Accepted Answer

Reptiles are considered the most primitive based on the structure of their limbs. They have relatively simple, sprawling limbs with five digits, which is less advanced compared to the more specialized limb structures of birds, penguins, and bats, which have undergone significant adaptations for flight. Porpoises are mammals and have fully adapted to swimming in water, so their limbs are not comparable to those of land-dwelling organisms.

Which Organisms Are Considered Most Primitive Based Upon the Structure